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          Spring的环境配置以及入门Demo
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        <h5 id="第一步：下载Spring的框架包"><a href="#第一步：下载Spring的框架包" class="headerlink" title="第一步：下载Spring的框架包"></a>第一步：下载Spring的框架包</h5><p>下载地址：<a href="https://repo.spring.io/release/org/springframework/spring/" target="_blank" rel="noopener">spring-framework-5.0.2.RELEASE-dist.zip </a>(这里下载5.0.2版本)</p>
<p>解压得到以下文件夹：<img src="https://img-blog.csdnimg.cn/20200220210320211.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMTkzMTMz,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述">在libs文件夹中有4个基础包，即<code>spring-core-5.0.2.RELEASE.jar</code>、<code>spring-beans-5.0.2.RELEASE.jar</code>、<code>spring-context-5.0.2.RELEASE.jar</code>和<code>spring-expression-5.0.2.RELEASE.jar</code>，分别对应Spring核心容器的4个模块，即<em>Spring-core模块</em>、<em>Spring-beans模块</em>、<em>Spring-context模块</em>和<em>Spring-expression模块</em>。</p>
<h5 id="第二步：下载commons-logging的jar包"><a href="#第二步：下载commons-logging的jar包" class="headerlink" title="第二步：下载commons.logging的jar包"></a>第二步：下载commons.logging的jar包</h5><p> Spring框架依赖与Apache Commons Logging组件<br> 下载地址 ： <a href="http://commons.apache.org/proper/commons-logging/download_logging.cgi" target="_blank" rel="noopener">commons-logging-1.2-bin.zip</a><br> 解压后得到<code>commons-logging-1.2.jar</code></p>
<p>对于Spring框架初学者，在开发Spring应用时只需要将Spring的4个基础包和commons-logging.jar复制到Web应用的WEB-INF/lib目录下即可。后续可以根据开发功能添加其他jar包。</p>
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<h5 id="第三步：入门Demo"><a href="#第三步：入门Demo" class="headerlink" title="第三步：入门Demo"></a>第三步：入门Demo</h5><ol>
<li>创建Web项目SpringDemo</li>
<li>导入JAR包<br><img src="https://img-blog.csdnimg.cn/20200220222150901.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMTkzMTMz,size_16,color_FFFFFF,t_70" alt="导入JAR包"></li>
<li>创建接口<code>TestDao</code><br>Spring解决的时业务逻辑层和其他各层的耦合问题，因此它将面向接口的编程思想贯穿整个系统应用。<br>在src目录下创建dao包，并在dao包中创建接口<code>TestDao</code>，在接口中定义一个<code>sayHello</code>的方法：<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> dao;</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">TestDao</span> </span>&#123;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">sayHello</span><span class="params">()</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></li>
<li>创建接口<code>TestDao</code>实现类<code>TestDaoImpl</code> ：<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> dao;</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TestDaoImpl</span> <span class="keyword">implements</span> <span class="title">TestDao</span> </span>&#123;</span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">sayHello</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		System.out.println(<span class="string">"Hello,Spring!"</span>);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></li>
<li>创建配置文件<code>applicationContext.xml</code> (配置文件名可以自定义) :<br>在src目录下创建Spring配置文件<code>applicationContext.xml</code>，并在该文件中使用实现类<code>TestDaoImpl</code>创建一个<strong>id</strong>为<strong>test</strong>的Bean :<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">&lt;?xml version&#x3D;&quot;1.0&quot; encoding&#x3D;&quot;UTF-8&quot;?&gt;</span><br><span class="line">&lt;beans xmlns&#x3D;&quot;http:&#x2F;&#x2F;www.springframework.org&#x2F;schema&#x2F;beans&quot;</span><br><span class="line">    xmlns:xsi&#x3D;&quot;http:&#x2F;&#x2F;www.w3.org&#x2F;2001&#x2F;XMLSchema-instance&quot;</span><br><span class="line">    xsi:schemaLocation&#x3D;&quot;http:&#x2F;&#x2F;www.springframework.org&#x2F;schema&#x2F;beans</span><br><span class="line">        http:&#x2F;&#x2F;www.springframework.org&#x2F;schema&#x2F;beans&#x2F;spring-beans.xsd&quot;&gt;</span><br><span class="line">	&lt;!-- 将指定的类TestDaoImpl配置给Spring，让Spring创建其实例 --&gt;</span><br><span class="line">    &lt;bean id&#x3D;&quot;test&quot; class&#x3D;&quot;dao.TestDaoImpl&quot;&#x2F;&gt;</span><br><span class="line">    </span><br><span class="line">    &lt;!-- more bean definitions go here --&gt;</span><br><span class="line">&lt;&#x2F;beans&gt;</span><br></pre></td></tr></table></figure></li>
<li>创建测试类<br>在src目录下创建test包，并在test包中创建<code>Test</code>类 ：<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> test;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.ApplicationContext;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.support.ClassPathXmlApplicationContext;</span><br><span class="line"><span class="keyword">import</span> dao.TestDao;</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test</span> </span>&#123;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">		<span class="comment">// 初始化Spring容器ApplicationContext , 加载配置文件</span></span><br><span class="line">		ApplicationContext appCon = <span class="keyword">new</span> ClassPathXmlApplicationContext(<span class="string">"applicationContext.xml"</span>);</span><br><span class="line">		<span class="comment">// 通过容器获取test实例</span></span><br><span class="line">		TestDao tt = (TestDao) appCon.getBean(<span class="string">"test"</span>);</span><br><span class="line">		tt.sayHello();</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<img src="https://img-blog.csdnimg.cn/20200220225435434.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMTkzMTMz,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"><br>上述实例并没有通过new 的方式创建TestDaoImpl对象，而是通过Spring容器火气实现类对象，这就是Spring IoC的工作机制。<br>（噢力给~~）</li>
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